Packing for shafts



Patente ug 19, 1924.

STATES 1,505321 PATENT OFFICE..

JAMES H. DENNEDY, O F DETROIT, MIGHIGAN.

Application flled September.l0, 1'921. Serial N0. 499,805.

T0 all whom z't may concem:

'Be it known that I, JAMES H. DENNEDY, a cioizen of the United States,residing at Detroit, county of Wayne, State of Michigan, have invented ac'ertain new and useful Impmvement in Packing for Shafts, and declarethe following to be a fu1], clear, and exact description 0f the same,such as will enable othsrs ski1led in the art t0 which it pertains tomake and use the same, reference being hac1 t0 the accompanyingdrawings, which fo rm a part of this specificaion.

This invention relates to packing for shafts and the object of theinvention -is to provide a device for preventing leakage of liquid o1gas along a shaft. Whi1e this in- -vention is applicable 1601 use onpractically all types of rotating shafts, it is paiticular- 1y adaptedfor use on the shaft of compressors in refrigerating systen'1s f0rpreventing leakage of the refrigerant such as ammonia gas, sulphurdioxide or the 1ike, the loss of which is very great where n0 provisionis made to prevent such leaka-ge. Another reason f0r preventing thisleakage is that am' monia gas 01 sulphur dioxide vvhen breathed in anyquantity is injurious and shou1d the leakage occur within therefri,qerator the food therein is contaminated. This invention is alsoadapted for packing a shaft against leakage of lubricating 0i1 or theingress of air and W111 also prevent leakage of the refrigerant evenwhen under considerable pressure. A further object of t1 1e invention isto provide a metallic packing which will remain tight nnder allconditions of teniperature 01 pressure and which is so designed as to beeasily assembled 01 removed. These objects and. the several novelfeatures of the invention are hereinafter fu1ly described and claimedand the preferred form of construction of a packing by which theseobjects are attained is shown in the accompanying drawings in which Fig.1 is a, section through the rns'zin bearing of a compressor showing'z;my improved packing.

F- Fig. 2 is a. section tanken 011 1ine- 22 of s shown in Fig. 1 a crankshaft 1 is pro- Vided to which the connectinp; rods of a cumpressor maybe attached. The crank shaft is rotatably mounted in a bearing 2 whichis provide d in the crank case 3 of the compressor, the crank case beingrecessed as shown in Fig. 1 to receive the packing. The

crank shaft is provided with a reduced portion 4 and a sleeve 5 ispositioned thereon, the said s1eeve being prov1ded with an annu- 1arflange 6 at the end. A gasket 22 is pro- Vided between the shou1der 2801: the shaft and end of the sleeve 5 and a gasket 24 is provided aboutthe portion 4 at the opposite end of the sleeve 5. The portion 4 0f thecrank shaft extends centrally through the annular 1ecess 7 inthe crankcase 3 and as will be noted from Fig. 1 the s1eeve 5 also extendsthrough this recess. A pair of mernbers 8 and 9 are positioned overthe'sleeve 5, the said members being central]y apertured to receive the,sleeve and' allovv clearance therefor and these members are sprea dapart by a coiled spring 10, which is also positioned over the sleeve 5as shown in Fig. l. Each of these members 8 and 9 carries' a-babbittring 11, the ring on the member 8 being adapted t0 pack the annu1ar faceof the flange 6 and tl1e 'ring on the mernber 9 being adapted to packthe 'corresponding face of an annular member 12 which is positioned overthe portion 4 of the shaft at the enc'l of the sleeve 5 and is held inplace by the nut 13 threaded 011 the shaft. When the mit-13 isturned upthe gaskef24 is bindingly en leakage between the sleeve and portion 4 01the' shaft. A pair-of centrally apertured metal discs or diaphrugms 14are provided, which about their central apertures are sweat intocorresponding annular grooves in the membrs 8 and 9 the discs 14 fittingwithin the recess 7 at the periphery. A centrally apertured c1isc 15isprovided-between 'the diaphragms 14 which fits Within the recess7 andacts as a spacer for the diaphragms. T0

su1)port'these diaphragms in position in the recess 7, I provide anannular member 16 having a beveled face 17 on the side toward thediaphragms and on the opposite side I provide member 18 having a beveledface 19 toward the diaphragms. Both of these members 16 and 18 fitclosely within the recess 7 and when brought together are adapted tobind the diaphragms 14 and apertured disc 15 together at the peripheryproviding a leak proof joint. T0 bind the mernbers 16 and 18 tightlytogether I provide a member 29 having an annular shoulder 20 adapted tofit wi thin the recess; This member 29 is provided with a series ofaperturesto receivethe bolt's 21 which are threaded into.the casing o rhousing 3 and hydrawing up the bol-ts 21 the annular shoul der 20 isforced into the redess 7 which binds the 1i1embers 16 and 18, diaphragms14 and disc 15 between the bot tom of the re0ess Z and the'annulaishoulder 20. It ean thus be seen that gas or liquid cannot escape fromthe periphery of the recess 7 nor between the portion 4 of the shaft andthesleeve 5 dne to the gasket 22 and- 24 and, as the s haft andsleeve-are rotating, leakage of gas ispre'verited about the exterior o1the sleeve 5 by the babbitt ring 11 which is held in tight engagementwiththe flange 6 of the sleeve by the spring 10. It

will also be noted that during rotation of the shaft the n1 1t 13rotates therewith and due to the annular. member 12 being bindinglysecu1ed in plaoe by the nut l3-the saicl membe-r 12 Will rotate with thenut and shaft While the babbitt ring 11 and m embers 8 and 9 remainstationary. By this construction even if the gas passed the first ring11 it is prevented fro m escaping by the second babbitt ring 11 on themember 9 and the gas is prevented from passing outWardly along the'shaft by1zhe gasket 24 and nut 13. As the babbitt rings Wear thememb6rs. 8 and. 9 will be forced apart by the coiled spring 10 whichalways maintains the babbitt rings in tight engagement with the flange 6and annular member 12 so that 110 leakage can oc cui. This deVice Willalso prevent leakage of gas eve n when under eonsiderable pressure asthe pressure-wonld have t0 build up in the recess 7 v sufiicient tofurther compress the spring 10 before leakage could occur and should thepressure be sufficient to accomplish this, -the member 9 would be forced01itward with greater press'ure Whi0h would -build up between themembiars 8 and 9 and the diaphragms. 14 thereb more tightly pack thebabbitt, fing 11 0 lar member 12.

F rom the foregoing description it becomes evident that the device isvery simple and eflicient in operation, will not gei; 0nt of order, iseasily assembled or disassembled and provides a device whichaccomplishes. the

' objects described.

faces,

Having thus fully' described my invention, its utilityand mode ofoperation, what I claim and desire t0 secure by Letters Patent 0f theUnited. States is 1. In a packing for shaft, in cbmbination, a casinghaving a recess, a shaft. exte'mdin centrally throgh the said recess, apair 0- rings fitting Withiu thefrecess and having companion taperedfaces,

cess and positioned between the tapered a centrally apertured metal discpo-' 31111011ed. betwaen and spacing the dia the memlier .9v agamst theoorresponding face 0f. the annu,

trally apertured diaphragms fitting within a-pair of centrally 1apertured diaph'ragms fitting within the re- 'ried by each annularmexiuber, a sleeve sealed to the shaft and having an annular fiange, aring at the andof the sleeve opposite the flange, a nut threaded an theshaft and supporting the ring in position andcoile d spring about thesleeve forcing the annular members apart and causing the packing ringsto (angage the annular flange and ring.

2. In a packing for shafts, in cotnbination, a casing having a reess, ashaft extenoling centrally through the said recess, a pair of ringsfitting within the recess havi1ig companion tapered faces, a pa ir 0fcentrally a-pertured diaphragms fit'ting withinthe recess and positionedbetwen the tapered fac'zes, an annular spacer between the peripheties ofsaid diaphragms, a clamp membe'rhaving an annular Shoulder fittingWithin the recess, ineans for drawing the clamp mernber up 110 bind therings, diaphragms, and disc betweeu the bottom of the recess and theannular shoulder, an an- 95 .nular member secnred t'o each diaphragm atthe central aperture, a packing ring carried -by each annular member,means se'aled to the shaft against which the packing rings are adaptedto engage', and a -sprin forcing the annular members to'w1rd sa1d lastmentioned means.

' 3. In a packixig f0r Shafts, in combination, a casing.having a-ress, ashsift extending therethrough, a pair of centrally apertured springmetal diaphragms within the recess, a pair 0f rings fitting the recessand positioned on opposite sides of the diaphragrhsand having taperedfaces adjacent the respective diaphragms, a cupped ring secured to theperiphery of each diaphragm ab the center the two cupped rings being inopposed relation and extending abot the shaft. packing ring 011 theexterior face of each cupped ring, and a coiled expanding spring betweenthe cupped rings, there being a contact surface provided for engagementby each packin ring.

4. In a acking for s afts, in combinati on, a casmg having a recess, ashaft. extending centraliy thrbugh the said recess, a pair of ringsfitting within the reoess having cqmpanion tapel'ed faces, a pair ofcanthe recess and positioned between the tapered faces, a centrallyapertured metal disc positioned betwe'en and Spacing the diaphragms,means for drawing the rings to gether to seal the diajphragms ab theperi hery, an annular member secured to each a.-

phfgm ab th ciantral wperture, a packing ring carried -by each annularmem'ber, means sealed to the shaf't against which the packingf rings areadapted t0 engage and a sprin forcing the annular members apart,

5. s a packing, f01 shafts, the combination of a casing, a shaftextending therethrough, a pair 0f centrally apertured diaphragm discsdisposed around said shaft, an annular contact member secured 130 each0f' said discs at their inner margins, coutact 1I1embers 011 said shaftfor engaging said contact members 011 said discs, spring means urgin'gthe respective engaging cpntact members together, annular clamp1ngmernbers on the opposed sides of said discs for clamping s'aid discstogether at their outer margihs and a rigid eircular platze clamped atits pe1iphery between said discs and extending inwardly substantially t0said contact members on said discs for spac- 4 ing said discs and forlimiting their flexure.

6. In a, packing for s'hafts, in eombination, a shaft, a, casing havingan aperture through which said shaft extends, a p9ir of clmnping ringssupported within said casing, having companion tapered faces, a pair ofcentrally apertured dizvphragms positioned at their peripheries betweensaid faces a1 1d sealed by said clamping rings to said casing, spacingmeans for the peripheries of said diaphragms, an annular membar securedto each diap-hragm at its centra1 aperture, and means including a,packing ring for efl'ecting a rotary seal between euch of said annularmembers and said shaft.

In testimony Whereof, I sign this specification.

JAMES H. DENNEDY.

